Stringed musical instrument



FIG. 1 is a top plan view of the stringed musical instrument showing my new design;

FIG. 2 is a right side view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a front view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken lines represent the portions of the stringed musical instrument that form no part of the claimed design. 

CLAIM The ornamental design for a stringed musical instrument, as shown and described. 